The folks at BuzzStream and Fractl conducted a survey of more than 900 respondents to better understand why people un-follow brands on social networks. And the infographic below, titled The Unfollow Algorithm, illustrates what they found.

Here's are some key highlights:

• On Facebook, 25 percent said that they unfollowed a brand's official social media account in the last month.

• On Twitter, 12 percent of Tweeters said that they unfollowed a brand in the last few days.
• 49 percent said that they never unfollow brand on LinkedIn.

• 21 percent said they will unfollow a brand if the content is repetitive and boring.

• 19 percent said they will unfollow a brand on Facebook if it posts too frequently (more than 6 times per day).

• 22 percent of the respondents said that "images" is the most preferred content type posted by brands. content.